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>> Free CompTIA N10-009 Exam Questions <<
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NEW QUESTION # 289
Which of the following methods ensures that devices authenticate before gaining access to the network, using a RADIUS server for identity verification?
Answer: B
Explanation:
802.1X is a port-based Network Access Control (NAC) method that enforces authentication before allowing access to the network. It uses a RADIUS server for identity verification and policy enforcement, ensuring only authorized users/devices gain access.
* A. Standard ACL filters traffic by IP, not identity.
* B. MAC filtering controls devices by hardware address but can be spoofed.
* D. SSO (Single Sign-On) provides user convenience across services, not network-level access control.
References (CompTIA Network+ N10-009):
* Domain: Network Security - NAC, 802.1X authentication, identity-based access.
NEW QUESTION # 290
Which of the following uses the longest prefix match to determine an exit interface?
Answer: B
Explanation:
The longest prefix match is a routing concept used to find the most specific route to a destination IP address.
The routing table performs this calculation to determine the exit interface for a packet, ensuring the most accurate delivery. The document explains:
"Routers use the longest prefix match when searching the routing table to determine the best path for an IP packet. This ensures that the most specific (and thus optimal) route is chosen, based on the destination IP address."
NEW QUESTION # 291
A network administrator needs to assign IP addresses to a newly installed network. They choose
192.168.1.0/24 as their network address and need to create three subnets with 30 hosts on each subnet. Which of the following is a valid subnet mask that will meet the requirements?
Answer: D
Explanation:
To create three subnets with at least 30 hosts each:
Subnet Calculation: Each subnet must support 32 addresses (30 usable + 2 reserved for network and broadcast).
Bits for Subnets: Subnet mask 255.255.255.192 (/26) provides 64 addresses per subnet (4 subnets total).
Valid Subnets: Each subnet provides sufficient IPs to meet the requirement.
NEW QUESTION # 292
Which of the following steps of the troubleshooting methodology would most likely include checking through each level of the OSI model after the problem has been identified?
Answer: A
Explanation:
Introduction to Troubleshooting Methodology:
Network troubleshooting involves a systematic approach to identifying and resolving network issues. The CompTIA Network+ certification emphasizes a structured troubleshooting methodology.
Troubleshooting Steps:
Identify the problem: Gather information, identify symptoms, and question users.
Establish a theory of probable cause: Consider possible reasons for the issue.
Test the theory to determine cause: Validate the theory with tests.
Establish a plan of action to resolve the problem and implement the solution: Create and execute a resolution plan.
Verify functionality and implement preventive measures: Ensure the solution works and prevent recurrence.
Verifying Functionality:
After implementing a solution, verifying functionality ensures that the problem is fully resolved. This involves testing the network to confirm that it operates correctly.
Checking through each level of the OSI model helps to ensure that all potential issues at different layers (physical, data link, network, transport, session, presentation, and application) are addressed.
Explanation of the Options:
A . Establish a theory: This step involves hypothesizing possible causes, not verifying functionality.
B . Implement the solution: This step involves executing the resolution plan.
C . Create a plan of action: This step involves planning the resolution, not verification.
D . Verify functionality: This step involves comprehensive checks, including OSI model layers, to ensure the issue is fully resolved.
Conclusion:
Verifying functionality is a critical step in the troubleshooting process, ensuring that the network operates correctly after a solution is implemented. It involves thorough testing across all OSI model layers.
Reference:
CompTIA Network+ guide explaining the troubleshooting methodology and the importance of verifying functionality (see page Ref 9fBasic Configuration Commands).
NEW QUESTION # 293
Which of the following is a reason to decide on the approach when troubleshooting an incident?
Answer: B
Explanation:
Deciding on the troubleshooting approach helps the technician choose the most efficient method based on scope, urgency, available tools, and resources, reducing unnecessary effort while isolating the issue effectively.
NEW QUESTION # 294
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